Trigger mechanism for automatic firearms.



.I. T. S. SCHOUBOE.

TRIGGER MECHANISM FOR AUTOMATIC FIREARMS. APPPICATION FILED IAN-5.19M.

Patented June 26, 1917.

2 SHEETSSHEET I.

J. T. S. SCHOUBOE.

TRIGGER MECHANISM FOR AUTOMATIC FIREARMS.

-APPLICATION FILED JAN-5.19m.

1 ,230,930. Patented June 26, 1917.

2 SHEETS-SHEET 2.

l I TTY JENS THEODOB SUHR SCHOUIBOE, OF HOLTE, NEAR COPENHAGEN, DENMARK.

TRIGGER- MECHANISM Specification of Letters Patent.

FOB AUTOMATIC FIREARMS.

Patented June 26, 1917.

Application filed January 5, 1916. Serial No. 70,336.

To all whom it may concern:

Be it known that I, J ENS THEODOR SUHR SCHOUBOE, a subject of the King of Den mark, residing at Holte, b Copenhagen, in the Kingdom of Denmar have invented new and useful Improvements in Trigger Mechanism for Automatic .Firearms, of which the following is a specification.

Device in trigger mechanism for automatic firearms.

I, J ENS THnoDoR Sunn SoHouBoE, of'Holte,

- by Copenhagen, in the Kingdom of Den- 'mark, director, do hereby declare the nature of this invention and in what manner the same is to be performed to be particularly described and ascertained in and by the following statement This invention refers to a. device in a trigger mechanism for automatic firearms with a movable barrel of the kind set forth in my Patent No. 836,713.

The chief feature of the invention is that the recoil lever, which, actuated by a spring contracted by the recoil, serves to carry the barrel and the breech block with the breech parts forward into firing position, is looked after the recoil, when the trigger islet go, so that it cannot carry the breech forward into firing position, thus preventing the insertion of any cartridge into the chamber after the firing has ceased.

One form of construction of this invention is illustrated, by way of example, in the drawing, 'in which Figure -1 shows the trigger mechanism viewed from the right side with the parts in that position which they assume after completed return motion,

Fig. 2 is the same viewed from the left side, with the parts in the same position as shown in Fig. 1,

Fig. 3 is the same viewed from the right side, with the parts in the position which they assume after completed forward motion, but before the shot is fired off and Fig. 4 is the same viewed from the right side, with the parts in the position which they assume after completed forward motion, but after the shot has been fired off.

1 is the percussion lever, and 2 is the recoil lever, both of which have a bearing on a bolt 26 in such a manner that the percussion lever is revoluble upon it, while the recoil'lever follows the movements of the bolt. 6 is the percussion spring, and 5 is the recoil spring, both of which are brought to a tension by the return motion of the breech block 4.

7 is the trigger lever, which is revoluble upon a bolt 16, and which, by means of a spring 13,-is normally held in its foremost position (see Figs. 1 and 2). The front end of the trigger lever is revolubly connected with an upward turned hook 8, which is passed through a hole in the sear 9, and which by means of a hook 20 catches over the latter under the influence of a spiral spring 14. The latter, also holds the hook 8 pressed in against the hub 12 of the recoil lever 2. The scar 9 carries a catch 23, which passes up behind a shoulder 28 on the hubpiece 11 of the percussion lever.

10 is a block (see Fig. 2) which can be slid along the sear 9, underthe influence of an arm 1 on the trigger lever 7.

According to my invention, there is disposed on the bolt 21 of the sear a catch a, which is revoluble upon'the bolt. The catch a has a dog 6, which passes up behind a projection .0 on the hub 12 of the recoil lever 2. The catch a has a'downward-bent limb d,

which carries a catch-hook. e, and in which I there is a groove f for a stud g on' the trigger lever 7 h is a securing and releasing lever, which is revoluble upon a pin 7', and which carries a head is, a dog Z and a short lever m. At its bottom the releasing lever is shaped like a fork n. 0 is a spring, which is stretched between the catch a and the releasing lever h, and which tends to pull the upper end of the releasing lever in toward the downwardturned limb d of the catch a.

In automatic fire, the trigger is pulled back as far as it will go and is held in this position for continuous firing. As will beseen by Figs. 3 and 4, the catch a is, by means of the trigger, turned downward so much that the dog Z on the releasing lever k can catch over the catch book 6 on the catch a, while the upper part of the releasing lever is pulled back against the catch a by means of the spiral spring 0. This position is assumed by the releasing lever h while the shot is being fired ofi. When'the breech block then returns and the recoil lever is thereby turned back into its retracted position, the projection 0 on the hub piece of the latter presses against the head In of the releasing lever, turning the lever, and the dog Z is carriedv away fromthe catch-hook e.

This forward or backward turning of the releasing lever h takes place automatically as long as the automatic fire continues, or as long as the trigger is pulled back as far as it wil go.

When the fire is to cease, the trigger, is let go. If this takes place when the breech block is returning or has entirely completed its return movement, the dog Z of the re leasing lever is disengaged from the catch hook e, and consequently the spring 13 can immediately turn the trigger and thereby also the catch a upward into normal position (see Fig. 1), whereby the recoil lever is locked, so that it cannot carry the breech forward again.

If the trigger is let go while the barrel and breech block are being put into firing position, the cartridgewhich is passed-into the chamber during the forward motion will be fired off, since the catch a, and therefore the trigger, cannot be turned, since the dog Z, as soon as the forward motion has begun, passes in over the catch-hook e, and the sear 9 cannot pass up in front of the shoulder 28 until the recoil lever, during the following return motion, has released the catch a, as set forth above.

Having now part cularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is j 1. In a trigger mechanism for automatic fire-arms, the combination with a trigger, a movable percussion member, a sear for the said member and a movable recoil member, of a movable catch adapted when in beer and secure it against breech-closing movement upon arrival at its retracted position, means controlled by the trigger for rendering the said catch inoperative when the trigger is pulled, and releasable means adapted to secure the said catch automatically upon arrival at its inoperative p0sition.

3. In a trigger mechanism-for automatic fire-arms, the combination with a trigger, a movable-percussion member, a scar for the said memberand a movable recoil member,

'of a movable catch adapted when in 0perative position to engage the recoil member and secure it against breech-closing movement upon arrival at its retracted posirendering the said catch inoperative when the trigger is pulled, releasable means adapted to secure the said catch automatically upon arrival at its inoperative position, and means controlled by movement of the recoil member for rendering the said securing means for the catch inoperative during each breech-opening movement of the recoil member as it reaches its retracted position.

4. In a trigger mechanism for automatic fire-arms, the combination with a trigger, a movable percussion member, a sear for the said member, and a movable recoil member having a projection, of, a 'movable catch adapted when in operative position to engage the recoil member and secure it against breech-closing movement, means controlled by the trigger for rendering the said catch inoperative when the trigger is pulled, a

tion, means controlled by the trigger for movable securing member adapted when in operative position to engage the said catch automatically upon arrival at its inoperative position, the said securing member having a part thereof disposed in the path of the projection on the recoil member, the said projection being disposed so that it will trip the said securing'member and render it inoperative during each breech-opening movement of the recoil member as the latter arrives at its retracted, position, and yieldable means tending normally to restore the said securing member to operative position.

5. In a trigger mechanism for automatic fire-arms, the combination w th a trigger, a

movable percussion member, a scar for thesaid member, and a movable recoil member having a projection, of a movable catch having a tooth adapted when in operative position to engage the said projection to secure the recoil member in retracted position, means controlled by the trigger for rendering the said catch inoperative when the trigger is pulled, a movable securing member adapted when in operative position to engage the said catch automatically upon arrival at inoperative position, the said securing member having a part thereof disposed in the path of the projection on the recoil member, the said projectionbeing disposed so that it will trip the said securing member and render it inoperative during each breech-v opening movement of the recoil member as it arrives at its retracted position, andyieldable means tending normally to restore the said securing member to operative position.

6. In a trigger mechanism for automatic firearms, the combination with a trigger, a

movablepercussion member, a scar for the said member, and a movable recoil member having a projection, of a movable catch having a tooth ad'apted when in operative position to engage the said projection to secure the recoil member in retracted position, means for connecting said catch pivotally to the trig fr so that the catch will be withdrawn rom operative position when the trigger is pulled.

7. In a trigger mechanism for automatic fire-arms, the combination with a trigger, a movable percussion member, a sear for the said member, and a movable recoil member having a projection, of a pivoted catch having a tooth adapted when in operative position to engage the said projection to secure the recoil member in retracted position, means for connecting the said catch pivotally to the trigger so that the catch will be withdrawn from operative position when the trigger is pulled, a pivoted securing member disposed adjacent to the said catch and recoil member, the said catch being provided with a hook and the securing member having a, dog adapted to engage the said hook when the catch is in inoperative position to secure the latter therein, the said securing member having a part thereof disposed in the path of the projection on the recoil member, the said projection being disposed so that it will trip the said securing member and render it inoperative during each breech-opening movement of the recoil member as it arrives at its retracted position, and a spring connected with the said securing member and tending normally to restore the latter to 0perative position.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JENS THEODOR SUHR SCHOUBOE.

Witnesses:

V. BELSCHNER,' I. JENSEN. 

